Tire-chain mechanism.



C. PETERSON. TIRE CHAIN MECHANISM; APPLICATION FILED 10170.12, 1911.

- Patentd Mar. 26, 1912.

CARL PETERSON, 0F PORTLAND, OREGON.

mine-CHAI MECHANISM.

Specification of Letters Patent. Patented Mai. 26, 1912- Applicationfiled December 12,.1911. Serial No. 665,391.

To all whom it may concern:

Be it known that I, CARL PETERSON, a subject of the King of Norway,residing at Portland, in the county of, Multnomah and State of Oregon,have invented certain new and useful Improvements in Tire-Chain'Mechanism, of which the following is a specification. My inventionrelates to a chain mechanism for resilient tires, such as are largelyused on selfpropelled vehicles.

The tires of heavy automobile trucks are generally made of softresilient rubber and are frequently of a double construction.

That is to say they are so shaped, that a cross sectional view of thetire shows two semicircular treads separated by a rather wide groove.

The object of my invention is to provide a detachable chain mechanismfor this typeof tires, whichwill effectually serve .to prevent skiddingor slipping of the tire, and to this end my device 1s so constructed,that part of the mechanism is confined within said groove, whereby mydevice is firmly held in lace.

The further objects and advantages of my invention are clearly set forthin the following description, and the appended drawings illustrate ameans of reducing my invention to practice.

In .the drawings: Figure l is a side elevation of a wheel .showing'mychain mechanism mounted in position, Fig.2 is an end elevation'inagreement with Fig. 1, Fig. 3

shows my device detached, Fig. t shows in enlarged perspective one ofthe chain units,

hung on an eyebolt e,

' naling ,and Fig. 5 illustrates a means of interlocking the ends of mychain mechanism.

Wheel a is of any well known construction and its tire presents the twosemicirculartreads Z2, 0. My chain mechanism comprises a uniform seriesof units, each unit composed of a relative large loop d loosely and aplurality of small connecting links f. 1

By referring to Fig. 4: my means of jour-- the loop on the eyebolt isreadily seen. The loop is made with diametrically opposite lugs g, boltextends, and it is noticed that the perforations of said lugs aresomewhat larger than the eyebolt. Attention is also called to the sha aof the lug perforations, at least one of which, as i, is made square,and by tightly. around the tire I 71,, through which the eye-' squaringthe part of the, eyebdlt which seats in perforations z', excessiverotation of the loop on said eyebolt is prevented.

The width of lugs g, h is substantially the same as the width of tiregroove j,'and

as said lugs seat in said groove; the Whole chain mechanism is heldagainst latera'lfdisplacement. I

In Fig. 5

interlocking the ends of y 'c ain mecha-.

I show a mnveni e t means' of nism. The unit atone end of thechain isconstructed as described abovei The boltof the other end unit is made intwo parts is, Z, the abutting ends of which are provided'with right andleft screwthreads and adapted to receivea suitable threaded sleeve orturnbuckle m, by meansfof which the length of the chain mechanism isadjusted.

The projecting end joflt member Z is formed-into a hook. 11. ad pte'd toengage link f of the abutting chainunit. I

In order to draw my chain mechanism GIQPIQY a suitable wrench, such asshown i cated jaw "g, and the latter isprovided a. stem 1*, thescrewthreads of which engage a-threaded knuckle s journale-d inthe-bifurcation of lever 0.

. Fig. 5. The wrench lever or-handle' oPis made with a bifurcated jawpadapted to grip one loop d while the other-loop is engaged by abiflII-i Wrench 0, while convenient'for the attachmerit of-the chainmechanism to the tire, is not indispensable as the 0 am may beinterlocked and then drawn tig t on the .tire by turnbuckle m. ydescribed my invention, I I

Having thus claim 1. In a the chain mechanism, in combination with adual treadtii'e; a plurality of loops; a pair of lugs on each loop, saidlugs adapted to engage the groove of the tire; a

continuous chain comprising a series of eyebolts journaled in said lugsand-aseries of intermediate links connecting said eyebolts'; means foradjusting the length of the chain; and means cooperating with saidadjusting means for interlocking the ends of the chain.

2. In combination with a ooved resilient tire, a detachable chain mecanism comprising: a series of loops adapted to seat on the periphericalsurface of the tire; perforated.

lugs on said loops adapted to engagethe tire groove, wherebyv said loopsare held against transverse displacement; a chain composed of a seriesof eyebolts journaled in the per- Intestimony whereof I aflix mysignature forations of said lugs and provided with in the presence oftwo Witnesses. means for limiting the oscillatory motion of v the loopson the eyebolts, and a series of in- I CARL PETER-SON. 5 termedlatelinks operatively connecting said Witnesses: eyebolts; and means foradjustably inter- Imam. MOORE,

locking the ends of said chain. C. W. HILLS.

